Method for casting pipes



May 13, 1930.

J. H. UHRIG METHOD FOR CASTING PIPES Filed May 18.

Patented May 13, 1930 UNITED sT TEs PATENT OFFICE. T

JOHN H. UERIG, 013 BEVERLY, JERSEY, ASSIGNOR TO UNITED STATES CAST IRON PIPE & FOUNDRY COMPANY, OF

NEW JERSEY BURLINGTON, NEW JERSEY, A CORPORATION 01 METHOD FOR CASTING PIPES 'type in which relatively longitudinally movable molds and runners are employed, the

' metal being delivered to the mold through the end of the runner progressively as the mold is retracted from the runner so that the metal may be said to be delivered to the surface of the mold in a spiral coil. In the practice of this de Lavaud method it is found necessary that the mold and runner should be inclined to the horizontal in order to insure a sufliciently rapid flow of molten metal through the runner and'under certain conditions the metal delivered to the mold has a tendency to move longitudinally in the mold before it sets, thereby bringing about an undesirable thickening and thinning of the cast in and the object of my invention is to provi e an improved method of casting said pipes by which this tendency to longitudinal movement of the metal in the mold is counteracted and a pipe of uniform thickness in its body portion is secured.

Generally speaking, my invention consists of reducing the angle of tilt of the mold and runner during the casting operation so as to counteract the tendency of the fluid to flow longitudinally in the mold to an undesirable extent, the lessening of the angle of tilt taking place during the pouring operation and as the mold is withdrawn from the runner and being within the control of the operator so that the tilt can be re latedinaccordance with the condition of t e molten iron flowing into the mold and, in practical operation, another important feature of my invention consists in pouring the metal into the runner at a point bearing a fixed relation to the mold into which the runner enters, thereby pro-' gressively shortening the distance through which the metal has to flow through the run- Ap'plication filed May 18, 1928. Serial No. 278,708.

grammaticviews partly in section of the de Lavaud pipe casting machine adapted for use in the practice of my improved method.

Figure 1 shows the machine in its initial inclined position with the end of the runner practically registerin with the mold. and pouring metal into t e mold.

Figure 2 shows the machine with the tilt diminished with the runner nearly half withdrawn from the mold and about half of the casting com leted, and

Figure 3 s ows the machine tilted to horizontality and the runner almost entirely withdrawn from the mold.

A, A and A indicate supports for the frame B of the machine which is supported on the tracks or supports A, A by means of the wheels B all of the supporting tracks to be formed on arcs of concentric circles. C is abracket extending out from the end of the frame B and supporting a runner indicated at C C being the open end of the runner through which the metal issues into the I mold. D is the ordinary water box carriage of a de Lavaud pipe casing machine, longitudinally movable on the frameB and supported thereon by wheels indicated at D E is the centrifugal mold rotatably supported in the water box carriage having, as shown, a bell indicated at E I F is a ladle supporting carriage longitudinally movable on the frame B and supported thereon by wheels indicated at F, G is a ladle supported on the carriage F and G a runner by which the metal from the ladle is delivered to the runnerC H indicates the casting in process of formation in the mold, H indicating the bell end of the casting. I and I indicate an electro-magnet and armature attached respectively to the caremployed for shifting the carriage D on its 100 supporting track so as to vary its angle of inclination.

In operation the mold is first tilted to its maximum extent, as shown in Figure 1. The carriage F is coupled to the mold carnage and the ladle G gradually tilted so that metal v will flow through it through the runner G into the runner F and from the end of the runner F into the bell end of the mold, as indicated in Figure 1. During the pouring the mold is moved toward the left and the operator decreases the tilt of the frame andsupported parts as the pouring progresses and to such extent as, depending on the fluidity of the metal entering the mold, is necessary to prevent any objectionable longitudinal flow ofthe metal. As the pouring proceeds the ladle carriage F remainsrelatively stationary with regard to the mold so that the flow of metal through the runner E ner is withdrawn from the mold and by pouring the molten metal into the runner during the casting of the ipe at a point close to the end of the mold t rough which the runner enters the mold.

'- JOHN H. UHRIG.

is constantly lessened, the diminution of frictional resistance to the flow of metal compensating to a great extent for the diminished angle of inclination of the runner and the spigot end of the pipe can be poured with the mechanism by means of which it is carried into effect.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In the operation of a centrifugal pipe casting machine comprising a centrifugal moldnormally inclined to a horizontal plane and a relativel longitudinally movable inclined runner t rough the end of which molten metal is delivered to the rotating mold as the runner is progressively withdrawn w therefrom, the mproved method of counteracting the tendency to longitudinal flow of the metal in the mold which consists in decreasing the tilt of the mold and of'the runner during the pouring of the metal and as the runner is withdrawn from the mold.

2. In the o eration of a centrifugal pipe casting machlne comprising a centrifugal mold normally inclined to a horizontal plane and a relatively longitudinally movable inclined runner through the end of which molten metal is delivered to the rotating mold as the runner is progressively withdrawn therefrom, the improved method of counteracting the tendcncy to gravital flow of the metal in the mold which consists in decreasing the tilt of the mold and of the runner during the pouring of the metal and as the run- 

